74051981 has 2 divisors, whose sum is σ = 74051982. Its totient is φ = 74051980.

The previous prime is 74051969. The next prime is 74052001. The reversal of 74051981 is 18915047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51337225 + 22714756 = 7165^2 + 4766^2 .

It is a cyclic number.

It is not a de Polignac number, because 74051981 - 2²⁶ = 6943117 is a prime.

It is a super-2 number, since 2×74051981² = 10967391780048722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74051921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37025990 + 37025991.

It is an arithmetic number, because the mean of its divisors is an integer number (37025991).

Almost surely, 2^74051981 is an apocalyptic number.

It is an amenable number.

74051981 is a deficient number, since it is larger than the sum of its proper divisors (1).

74051981 is an equidigital number, since it uses as much as digits as its factorization.

74051981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 74051981 is about 8605.3460709027. The cubic root of 74051981 is about 419.9319258529.

The spelling of 74051981 in words is "seventy-four million, fifty-one thousand, nine hundred eighty-one".